Joseph laubereau



Q eine Wam atexl @gc/ww if if@ met @zum www JOSEPH LAUBEREAU, OF PARIS, FRANCE, ASSIGNOR TO JOSEPH DE SUSINL OF SAME PLACE.

Letters .Patent No. 83,978, dated November 10, 1868.

`11i/InnoverenNT IN TOY-WATCHES.

being chiefi y applicable to various purposes where little force is required,-aud principally to regulators, toys, and more especially to toy-watches; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed sheet of drawings, making a part of the same.

My invention refers to a motor obtained by the tension of an elastic string, with variable self-acting brake proportionate to the work that the motor is liable to yield.

This variable self-acting brake-motor is applicable to various uses, where little force is required, viz, to regulators, toys, and more especially to toy-watches.

I have, in the aunexe'd drawing, represented such a motor as applied to a toy-watcb.

It consists,

First, of a lever, a, Figure l, moving on a pin, b, fixed to the case, which lever a has on its central part, a block, c, fixed thereto, and made of' any soft substance, such as fatty leather, India rubber, cork, soft wood, &c. 86o.

Secondly, of a silk, India-rubber, or other elastic string, d, or even a small spiral spring, 85e.

Thirdly, of a small shaft, e, having a pulley, f, affixed to it, on which the block c exerts a friction. Bothv the shaft and pulley may be foi-ined of' one same piece.-

Fonrtbly, of av grooved or guide-pulley, g, turning on a pin fixed in the case. The silk, Indiafrubber, 85o., string d, passing over the pulley g, allows of the said string being sufficiently long to be rolled three or four times round the shaft e under the pulley f. One end of this string enters a hole formed in' the shaft e, and is fixed thereto by means of a pin.

Fifthly, of' a cross-piece, h., serving as a guide and bearing to the shaft which carries the pulley f. This guide is pierced through its centre with a hole, which one end of' the shaft traverses, thus maintaining the shaft niovable. Above this guide the shaft e terminates in a square, to receive the hands. A. like square forms the other end, Figure 2, whereon fits the key for winding up the watch.

The two ends of the cross-piece h, Figure 3, are se# cured to the case. The journals preceding and next to the squares on shaft e, carry, each of them, a slight shoulder, and, to secure a smoother rotation of the shaft, a small., fatty, kid washer is fitted thereon. All these working-parts are enclosed in a Watchcase more or less elegant, with a dial, and the hands fitted on the projecting square thereon, and a glass over the whole, as usual.

When it is desired to set the watch in motion, g. 2, the key is fitted on the opposite square to the hands, and turned from left to right, as for an ordinary Watch. As the winding up goes on, the elastic string is rolled up round the small shaft e, to which one of its ends is attached, Whilst the other end is secured to the end of the lever a, which it pulls, and this, on which the soft leather block is placed, leans on the pulley f proportionately to the tension exerted on the elastic string After two, three, or more revolutions, the key is taken out. The hands proceed very slowly and regularly in consequence of the brake c bearing on the pulley f, the

pressure exerted by said brake being, as the string is being unrolled, proportionately less.

Claim.- The combination of thepulleys fg, elastic string d,

and friction-lever a e, with each other and with the 

